package com.bs.visitservice.utils;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/*对图片进行处理的类和方法*/
public class ImageCodeUtil {
        public static  String drawRandomText(int width, int height, BufferedImage verifyImg) {
            Graphics2D graphics = (Graphics2D)verifyImg.getGraphics();
            graphics.setColor(Color.WHITE);//设置画笔颜色-验证码背景色
            graphics.fillRect(0, 0, width, height);//填充背景
            graphics.setFont(new Font("微软雅黑", Font.BOLD, 40));
            //数字和字母的组合
            String baseNumLetter= "123456789abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
            StringBuffer sBuffer = new StringBuffer();
            int x = 10;  //旋转原点的 x 坐标
            String ch = "";
            Random random = new Random();
            for(int i = 0;i < 4;i++){
                graphics.setColor(getRandomColor());
                //设置字体旋转角度
                int degree = random.nextInt() % 30;  //角度小于30度
                int dot = random.nextInt(baseNumLetter.length());
                ch = baseNumLetter.charAt(dot) + "";
                sBuffer.append(ch);
                //正向旋转
                graphics.rotate(degree * Math.PI / 180, x, 45);
                graphics.drawString(ch, x, 45);
                //反向旋转
                graphics.rotate(-degree * Math.PI / 180, x, 45);
                x += 48;
            }

            //画干扰线
            for (int i = 0; i <6; i++) {
                // 设置随机颜色
                graphics.setColor(getRandomColor());
                // 随机画线
                graphics.drawLine(random.nextInt(width), random.nextInt(height),
                        random.nextInt(width), random.nextInt(height));
            }

            //添加噪点
            for(int i=0;i<30;i++){
                int x1 = random.nextInt(width);
                int y1 = random.nextInt(height);
                graphics.setColor(getRandomColor());
                graphics.fillRect(x1, y1, 2,2);
            }
            return sBuffer.toString();
        }

        /**
         * 随机取色
         */
        private static Color getRandomColor() {
            Random ran = new Random();
            Color color = new Color(ran.nextInt(256), ran.nextInt(256), ran.nextInt(256));
            return color;

        }

}
